Electronic keyboard



FIG. 1 is a front, top, right side perspective view of an electronic keyboard showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings illustrate portions of the electronic keyboard that form no part of the claimed design. 

CLAIM The ornamental design for an electronic keyboard, as shown and described. 